The ruling on the field is an interception.
Any forward pass (legal or illegal) is incomplete and the ball is dead immediately if the pass strikes the ground or goes out of bounds. An incomplete pass is a loss of down, and the ball returns to the previous spot.
Note: If there is any question whether a forward pass is complete, intercepted, or incomplete, it is to be ruled incomplete.
A catch is made when a player inbounds secures possession of a pass, kick, or fumble that is in flight. An interception is made when an opponent who is inbounds catches a forward or backward pass or a fumble that has not touched the ground.
The ruling on the field is a fumble.
A fumble is any act, other than a pass or kick, which results in a loss of player possession.
Exception: If a runner intentionally fumbles forward, it is a forward pass (3-22).
Item 1. Recovery and Advance. Any player of either team may recover or catch a fumble and advance, either before or after the ball strikes the ground.
The ruling on the field is a touchdown.
Item 1. Down by Contact. Whether a player was down by contact while in possession of the ball.
It is a Touchdown if any part of the ball is on, above, or behind the opponent’s goal line while legally in possession of an inbounds player, provided it is not a touchback.